It is generally safe to use aluminum tart molds in the convection mode of your LG microwave convection oven. Aluminum is a good conductor of heat and allows for even distribution, making it suitable for baking in convection ovens. However, it's important to ensure that the aluminum molds you are using are specifically labeled as safe for use in ovens or microwave ovens.
Before using the molds, carefully read the manufacturer's instructions and guidelines to ensure they are suitable for use in a convection oven. Additionally, make sure the tart molds are clean and free from any grease or residue before placing them in the oven.
Always follow the instructions and recommendations provided by the manufacturer of your LG microwave convection oven to ensure safe and proper usage. If you have any doubts or concerns, it's best to consult the user manual or contact LG customer support for clarification.